It is definitively possible to use events in process constraints. Your exception, though, implies that you are using a sliding time window on a fact type that is not declared as an event. In later versions I improved the error handling to raise a compile time error when this is detected, but I guess you are using 5.0.1, where it still throws a runtime exception:

java.lang.ClassCastException: org.drools.common.DefaultFactHandle cannot be
cast to org.drools.common.EventFactHandle        at org.drools.rule.SlidingTimeWindow.updateNextExpiration(SlidingTimeWindow.java:192)

   Can you double check your rules to make sure you are not doing that?

   Edson




2010/2/10 paulB <paul.borlin@sironahealth.com>

I'm not sure if I had stumped everyone, or my previous post a really dumb
thing for me to ask.  If it's something where I should have read the manual,
can anyone give me a hint?  Thanks!
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 Edson Tirelli
 JBoss Drools Core Development
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